linux-kernel - Re: Major mke2fs slowdown (reproducable, bisected)

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date:	Mon, 12 Nov 2007 10:39:15 -0800 (PST)
From:	Linus Torvalds <torvalds@...ux-foundation.org>
To:	Alexey Dobriyan <adobriyan@...il.com>
cc:	mel@....ul.ie, akpm@...ux-foundation.org,
	linux-kernel@...r.kernel.org, linux-mm@...r.kernel.org
Subject: Re: Major mke2fs slowdown (reproducable, bisected)



On Mon, 12 Nov 2007, Alexey Dobriyan wrote:
>
> Cross-compile farm here migrated to .ccache and build dir on separate
> disks and now I have a way to blow up .ccache without waiting half an
> hour for rm(1) to finish. It's called mke2fs(8).
> 
> However, in e.g 2.6.24-rc2 mke2fs is amazingly slow if done right after
> several fat cross-compile builds. Normally it takes ~11 seconds to
> finish. After commit 5adc5be7cd1bcef6bb64f5255d2a33f20a3cf5be aka
> "Bias the placement of kernel pages at lower PFNs" it takes several
> minutes. 2.6.24-rc2 without this patch also gives normal mkfs speeds.
> I'm pretty sure bisection wasn't screwed up.

Can you (just to make sure) do a "git revert" of this commit on top of the 
current tree, and verify that that makes it all work fine again too? If 
so, let's just revert it.

I just want to make sure that there isn't some subtle interaction with 
anything else in there.

		Linus
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/